Orin NX 16GB — NVDEC capacity for 4× 2560×1440 H.265 streams, and Super mode impact

[maimoon]

Hello,

Building a multi-camera vision application on Orin NX 16GB and would like to confirm decode capacity before finalising our hardware.

Our load: 4 concurrent RTSP streams, H.265 Main profile, 2560×1440 (4MP), 15–20 fps each, decoded via DeepStream and fed to a detection model.

The module datasheet lists decode as 2× 4K60, 4× 4K30, 9× 1080p60, 18× 1080p30 (H.265).

Three questions:

1. Our 4MP streams sit between 1080p and 4K. Is it correct to treat 4× 2560×1440 at 20fps as comfortably within the 4× 4K30 figure, or is there a pixel-rate limit I should calculate against instead?
2. Is NVDEC capacity affected by the power mode? Specifically, is decode throughput the same at 25W as at the 40W MAXN SUPER profile, or does it scale with clocks?
3. What is the correct way to verify at runtime that decoding is genuinely running on NVDEC rather than silently falling back to software? We want to confirm this on the bench rather than assume it.

Running JetPack 6.x. Any guidance appreciated.

[DaneLLL]

Hi,

@maimoon

1. Our 4MP streams sit between 1080p and 4K. Is it correct to treat 4× 2560×1440 at 20fps as comfortably within the 4× 4K30 figure, or is there a pixel-rate limit I should calculate against instead?

Yes. Because it can do 4x 3840x2160p30 H265 decoding, it is supposed to work well for 4x 2560x1440p20

@maimoon

2. Is NVDEC capacity affected by the power mode? Specifically, is decode throughput the same at 25W as at the 40W MAXN SUPER profile, or does it scale with clocks?

No, please check
Jetson Orin Nano Series, Jetson Orin NX Series and Jetson AGX Orin Series — NVIDIA Jetson Linux Developer Guide

Maximum frequency of NVDEC is same in different power modes.

@maimoon

3. What is the correct way to verify at runtime that decoding is genuinely running on NVDEC rather than silently falling back to software? We want to confirm this on the bench rather than assume it.

Please run $ sudo tegrastats to check status of NVDEC

[maimoon]

Thank you for your guidance and for clarifying our doubts.

Based on your recommendations, we are moving forward with purchasing the following hardware from Tanna TechBiz LLP:

• Nvidia Jetson Orin Nano Super Developer Kit
• Tanna TechBiz Eagle - 201 Full System (with Nvidia Jetson Orin NX 16GB Module)
• WD Blue SN5100 NVME™ SSDs (1TB)
• Meanwell Power Adapters, Cables, and Wireless NIC Accessories

We appreciate your support in helping us select the right components for our project!